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Finding the Fourth Proportional to 2,539.80, 3,809.95 and 690.93

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Solution

The fourth proportional to 2,539.80, 3,809.95 and 690.93 is: 1,036.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,539.80 : 3,809.95 = 690.93 : x
  2. Step 2: Convert to fraction form
    2,539.80/3,809.95 = 690.93/x
  3. Step 3: Cross multiply
    2,539.80x = 3,809.95 × 690.93
  4. Step 4: Simplify right side
    2,539.80x = 2,632,407.03
  5. Step 5: Solve for x
    x = 2,632,407.03/2,539.80
  6. Step 6: Final answer
    x = 1,036.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.